Radiator grille unit for a vehicle



FIG. 1 is a right, front perspective view of a radiator grille unit for a vehicle according to the design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof; and,

FIG. 4 is a top view thereof.

The broken lines in the drawings illustrate portions of the radiator grille unit for a vehicle that form no part of the claimed design. 

CLAIM The ornamental design for a radiator grille unit for a vehicle, as shown and described. 